Intriguing phenomena, such as non-Fermi liquid behaviour, spin or charge order, non-trivial band topology, and a complex crystal structure, often accompany unconventional pairing mechanisms and non-trivial, symmetry-breaking superconducting order parameters in phase diagrams. The Remeika 3-4-13 series is an example of a family of materials, which exhibits a wide array of diverse, exotic phenomena [1]}, [2]}, [3]}, [4]}, [5]}, and exciting properties, including the Kondo effect, spin-fluctuation superconductivity, multi-gap superconductivity, and many more [6]}, [7]}, [8]}. The Remeika phase has the form R\(_{3}\) A\(_{4}\) X\(_{13}\) , where R is a rare earth metal, A is a transition metal, and X is a group-14 element [9]}, and its structure motif is isomorphic to cage-like structures, namely clathrates and filled skutterudites [10]}, [11]}. The stannides of the 3-4-13 family are believed to be strongly-coupled superconductors with a second-order structural phase transition, pointing towards a strong interplay between the superconducting order and their structure [4]}, [13]}, [14]}, [15]}, [16]}, [17]}. Meanwhile, R\(_{3}\) A\(_{4}\) Ge\(_{13}\) , which are similar to the stannide structure, are scarce and mostly uninvestigated. A number of germanide compounds exhibit low-temperature superconductivity and paramagnetic character different from the stannides [18]}, [19]}; thus presenting an interesting platform in the 3-4-13 family to inspect the connection between crystal complexity and superconductivity.
